ASME B16.5 Blind Flange Archives | Quality Manufacturer of Industrial Pipe Fittings

Stainless Steel 316L Blind Flanges

zhao77jie — Tue, 16 Sep 2025 02:00:00 +0000

In early September 2025, we received another order from a long-term customer in the UK. This was their second order from us, again for Stainless Steel 316L blind flanges. Their requirements were very specific: not only did they prioritize on-time delivery, but they also placed particular emphasis on the flange’s appearance and the accompanying EN 10204 3.1 Material Test Certificate (MTC).

After receiving the order, we immediately arranged a production schedule. During the production process, we rigorously implement dimensional inspections, outer diameter measurements, and bolt hole distribution checks to ensure that every flange complies with ASME/EN standards.

Because of the customer’s high expectations for product appearance, we pay particular attention to the surface treatment of the flanges. All flanges undergo a visual inspection before shipment to ensure a smooth, flat surface, free of scratches or burrs. Furthermore, each shipment includes a 3.1 MTC, which fully documents the material’s chemical composition and mechanical properties, ensuring traceability and reliability. For packaging, we use plastic film wrapping and moisture-proof wooden crates to ensure safety during transportation while enhancing the overall aesthetics.

If you’re looking for a reliable stainless steel flange manufacturer, please feel free to contact us.

Outside Diameter Inspection

Use a caliper or specialized measuring tool to measure the flange’s outside diameter to ensure it conforms to the standard size.

Thickness Inspection

Measure the overall flange thickness and the sealing surface thickness to prevent deviations that could lead to insufficient strength or seal failure.

Bolt Hole Inspection

Check whether the number, diameter, and distribution of bolt holes meet standards.

Measure the bolt circle diameter (BCD).

Facing Inspection

According to customer requirements, inspect the sealing surface type (RF, FF, RTJ) and measure the roughness and surface flatness.

Marking Inspection

Confirm that the flange surface markings (material, specification, pressure rating, standard number, heat number) are complete and legible for traceability.

Other Visual Inspections

Inspect the flange surface for defects such as cracks, burrs, scratches, and rust.

Sealing Face	RF, FF, FTJ
Size Range	1/2” – 48” / DN15 – DN1200
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500lb
Standard	ASME / ANSI B16.5, ASME B16.47 Series A/B
Carbon Steel	ASTM A105 / A105N
Low Temp Carbon Steel	ASTM A350 LF2/LF3
Pipeline Steel	ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel	ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel	ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904L
Duplex Stainless Steel	ASTM A182 F51, F53, F44

ASTM A182 F316L Flange Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N
ASTM A182 F316	MIN						10.0	16.0	2.00
ASTM A182 F316	MAX	0.08	2.00	0.045	0.030	1.00	14.0	18.0	3.00	0.10
ASTM A182 F316L	MIN						10.00	16.0	2.00
ASTM A182 F316L	MAX	0.03	2.00	0.045	0.030	1.00	15.00	18.0	3.00	0.10

ASTM A182 F316L Flange Mechanical Property

MATERIAL	ASTM A182 F316	ASTM A182 F316L
T.S (MPA)	515 min	485 min
Y.S (MPA)	205 min	170 min
EL %	30 min	30 min
R/A %	50 min	50 min

Nominal Pipe Size		A	C	G	H	I	J	Weight
Nominal Pipe Size	mm	mm	mm	mm	Number of Holes	mm	mm	kg/piece
1/2	21.3	95.2	14.2	35.1	4	15.7	66.55	0.64
3/4	26.7	117.3	15.7	42.9	4	19	82.5	1.11
1	33.4	123.9	17.5	50.8	4	19	88.9	1.39
11/4	42.2	133.3	19	63.5	4	19	98.5	1.79
11/2	48.3	155.4	20.6	73.15	4	22.3	114.3	2.66
2	60.3	165. 1	22.3	91.9	8	19. 10	127	3.18
21/2	73.0	190.5	25.4	104.6	8	22.3	1.493	4.85
3	88.9	209.5	28.4	127	8	22.3	168.1	6.81
31/2	101.6	228.6	30.2	139.7	8	22.3	184.1	8.71
4	114.3	254	31.7	157.2	8	22.3	200.1	11.5
5	141.3	279.4	35	185.7	8	22.3	234.9	15.6
6	168.3	317.5	36.5	215.9	12	22.3	269.7	20.9
8	219. 1	381	1.620 41.10	269.7	12	25.4	330.2	34.3
10	273.0	444.5	47.7	323.9	16	28.4	387.3	53.3
12	323.8	520.7	50.8	381	16	31.7	450.8	78.8
14	355.6	584.2	53.8	412.8	20	31.7	514.3	105
16	406.4	647.7	57.15	469.9	20	35	571.5	137
18	457.2	711.2	60.45	533.4	24	35	628.6	175
20	508.0	774.7	63.5	584.2	24	35	685.8	221
24	609.6	914.4	69.85	692.2	24	41. 10	812.8	339

Class 300 Stainless Steel Flange Weight

Pressure	Size	SO	TH	SW	LAPJ	BL	WN
300LB	1/2	0.68	0.68	1.36	0.68	0.91	0.91
	3/4	1.14	1.14	1.36	1.14	1.16	1.36
	1	1.36	1.36	1.36	1.36	1.82	1.82
	1 1/4	2.04	2.04	1.82	2.04	2.72	2.27
	1 1/2	2.95	2.95	2.72	2.95	3.18	3.18
	2	3.18	3.18	3.18	3.18	3.63	3.63
	2 1/2	4.54	4.54	4.54	4.54	5.45	5.45
	3	5.90	6.36	5.90	6.58	7.26	8.17
	3 1/2	7.20	7.26	7.72	7.26	9.53	9.10
	4	10.67	10.90	9.99	10.90	12.71	12.03
	5	13.17	14.07	–	11.80	16.80	16.34
	6	16.34	16.34	–	17.25	21.79	20.43
	8	25.42	25.42	–	24.97	35.87	31.33
	10	34.96	36.32	–	39.95	55.39	45.40
	12	51.30	49.94	–	63.11	83.48	64.47
	14	72.19	74.46	–	83.54	109.41	93.52
	16	95.34	99.88	–	106.24	143.01	113.05
	18	114.86	127.12	–	138.40	187.96	138.92
	20	139.38	147.55	–	170.25	233.81	167.53
	24	222.46	222.46	–	240.62	363.20	235.63

Different Face Types

Similar to other flanges, blind flanges can have different face types to match the mating flange and gasket:

Raised Face (RF): The most common type, featuring a raised ring around the bore to concentrate sealing pressure.

Flat Face (FF): Has a flat sealing surface, typically used with flat face mating flanges, often in low-pressure applications or with fragile flanges.

Ring Joint (RTJ): Features a groove to accommodate a metal ring gasket, designed for high-pressure and high-temperature service.

Applications

Offshore and Marine Piping

Chemical Processing Plants

Water Treatment Systems

Pharmaceutical and Food Processing

Heat Exchangers, Pumps, and Valve Ends

The post Stainless Steel 316L Blind Flanges appeared first on Quality Manufacturer of Industrial Pipe Fittings.

Stainless Steel Blind Flange Specification

zhao77jie — Mon, 27 May 2024 03:02:47 +0000

Blind flange is a special type of flange,it has not central hole. Stainless steel blind flange common used to seal the ports of pipelines or equipment. When it is necessary to isolate a certain section of pipeline, install the blind flange on the end of the pipeline, and tightly connect the blind flange with the pipeline flange through fasteners to achieve a sealing effect. Stainless steel blind flange has advantages such as corrosion resistance, high temperature resistance, shock resistance, and pressure resistance. It can effectively protect the normal operation of equipment and pipelines.

Pipeline Sealing

Equipment Maintenance

Segmented Sealing of Pipelines

Prevent Media Mixing

Stainless steel blind flange have the advantages of convenient use, economic practicality, and good sealing effect. Meanwhile, it can also be classified according to different pressure levels to meet the needs of different fluid media.

Stainless steel blind flange specification include American standard ASME B16.5 ASME B16.47、MSS SP-44. European standard EN1092, etc. Size range from 1/2″ to 60″ .The pressure range: Class 150 to 2500; PN6, 10, 16, 25, etc.

Standards	ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Size	1/2″ to 48″
Designation	A 182 / A 240, SA 182 / SA 240
Class	150#, 300#, 400#, 600#, 900#, 1500# & 2500#.
Grade	ASTM A182 F304, 304L, 304H, 316, 316Ti, 316H, 316L, 316LN, 309S, 309H, 310S, 310H,317, 317L, 321, 321H, 347, 347H, 201, 202, 904L ETC.

ASME B16.5 is a standard for pipe flanges and flanged fittings, developed by the American Society of Mechanical Engineers (ASME). This standard specifies in detail the design, dimensions, material selection, manufacturing process, inspection methods, and marking requirements.

Feature

Material selection: Blind flanges can be made of carbon steel, stainless steel, alloy steel, etc.

Dimensions: The dimensions of blind flanges can be customized according to the needs of the pipeline system to ensure compatibility with pipes and other flange accessories.

Sealing performance: The sealing surface types of blind flange are diverse, such as raised face (RF), flat face (FF), concave convex face (MFM), etc., to meet different sealing requirements. Blind flange can achieve reliable sealing effect through bolt connection and gasket compression.

Detachability: Compared to welded heads or pipe caps, blind flanges have the ability to be disassembled, making it convenient for pipeline maintenance, expansion, or cleaning when needed.

Application : ASME B16.5 blind flange is widely used in the fields of petrochemical, natural gas industry, chemical industry, etc.

ASME B16.47 is a standard for large pipe flanges and flange fittings, developed by the American Society of Mechanical Engineers. This standard in detail the requirements for the size, pressure rating, material, testing, etc. Large pipe flanges and is applicable to the connection of large pipelines in industries such as petrochemicals, power.

Feature

Size and pressure rating: Stainless steel blind flange have a wide range of sizes and pressure ratings. According to ASME B16.47 standard the range of sizes from 26″ to 60″(DN 650 to DN 1500) or larger. In ASME B16.47 standard, the pressure rating of blind flange is divided into A series and B series. A series: includes 5 levels including Class 150, 300, 400, 600, 900, etc. B-series: includes 6 levels including Class 75, 150, 300, 400, 600, 900, etc. These pressure levels represent the pressure that the flange can withstand.
Materials: Blind flanges can be made of various materials, such as carbon steel, stainless steel, alloy steel, etc. The selection of specific materials depends on the application environment, medium requirements, and design conditions.
Sealing performance: The sealing surface types of blind flange are diverse, such as raised face (RF), raised face (MFM), etc. Blind flange can achieve reliable sealing effect through bolt connection and gasket compression.
Detachability: Stainless steel blind flanges are usually connected by bolts and nuts for easy disassembly and reinstallation. This allows for easy maintenance, expansion, or cleaning of pipelines when needed.
Application : ASME B16.47 blind flange is used in the fields of petrochemical, natural gas industry, power engineering, chemical industry, etc.

ASTM A182 F304 blind flange is made of ASTM A182 F304 standard material. This type of flange does not have a central hole and is mainly used to close the end of the pipeline or to isolate a certain part of the pipeline.
ASTM A182 F304 stainless steel is a low-carbon austenitic stainless steel with excellent corrosion resistance and mechanical properties. It contains approximately 18% chromium and 8% nickel, allowing it to maintain good stability in various corrosive media.
The design and manufacturing of ASTM A182 F304 stainless steel blind flange comply with relevant standards and specifications, ensuring reliable sealing and strength under various working conditions. It has a variety of sealing surface types, such as raised face (RF), flat face (FF), concave convex face (MFM), etc., and suitable sealing surface types can be selected according to specific application requirements.
ASTM A182 F304 blind flange is widely used in the fields of petrochemicals, natural gas industry, power, chemical industry, etc., for sealing large pipeline systems or isolating certain parts of pipelines. Its detachable nature allows for easy maintenance, expansion, or cleaning of pipelines when needed.
It should be noted that when selecting and using ASTM A182 F304 blind flange, reasonable selection and design should be made based on specific application environments and requirements, and relevant installation and maintenance standards should be followed to ensure its reliability and safety.

Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	N
ASTM A182 F304	MIN						8.0	18.0
ASTM A182 F304	MAX	0.08	2.00	0.045	0.030	1.00	11.0	20.0	0.10

Mechanical Properties

MATERIAL	ASTM A182 F304
T.S (MPA)	515 min
Y.S (MPA)	205 min
EL %	30 min
R/A %	50 min

CLASS 150 Dimension and Weight List

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	RF Dia.	RF Height	PCD	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E
1/2	15	90	9.6	34.9	2	60.3	4	1/2	50	55	5/8	M14	0.9
3/4	20	100	11.2	42.9	2	69.9	4	1/2	50	65	5/8	M14	0.9
1	25	110	12.7	50.8	2	79.4	4	1/2	55	65	5/8	M14	0.9
1 1/4	32	115	14.3	63.5	2	88.9	4	1/2	55	70	5/8	M14	1.4
1 1/2	40	125	15.9	73	2	98.4	4	1/2	65	70	5/8	M14	1.8
2	50	150	17.5	92.1	2	120.7	4	5/8	70	85	3/4	M16	2.3
2 1/2	65	180	20.7	104.8	2	139.7	4	5/8	75	90	3/4	M16	3.2
3	80	190	22.3	127	2	152.4	4	5/8	75	90	3/4	M16	4.1
3 1/2	90	215	22.3	139.7	2	177.8	8	5/8	75	90	3/4	M16	5.9
4	100	230	22.3	157.2	2	190.5	8	5/8	75	90	3/4	M16	7.7
5	125	255	22.3	185.7	2	215.9	8	3/4	85	95	7/8	M20	9.1
6	150	280	23.9	215.9	2	241.3	8	3/4	85	100	7/8	M20	11.8
8	200	345	27	269.9	2	298.5	8	3/4	90	110	7/8	M20	20.5
10	250	405	28.6	323.8	2	362	12	7/8	100	115	1	M24	32
12	300	485	30.2	381	2	431.8	12	7/8	100	120	1	M24	50
14	350	535	33.4	412.8	2	476.3	12	1	115	135	1 1/8	M27	64
16	400	595	35	469.9	2	539.8	16	1	115	135	1 1/8	M27	82
18	450	635	38.1	533.4	2	577.9	16	1 1/8	125	145	1 1/4	M30	100
20	500	700	41.3	584.2	2	635	20	1 1/8	140	160	1 1/4	M30	130
24	600	815	46.1	692.2	2	749.3	20	1 1/4	150	170	1 3/8	M33	196

CLASS 300 Dimension and Weight List

Size in Inch	Size in mm	Outer Dia.	Flange Thickness	RF Dia.	RF Height	PCD	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size	Weight in kg
		A	B	C	D	E
1/2	15	95	12.7	34.9	2	66.7	4	1/2	55	65	5/8	M14	1.4
3/4	20	115	14.3	42.9	2	82.6	4	5/8	65	75	3/4	M16	1.4
1	25	125	15.9	50.8	2	88.9	4	5/8	65	75	3/4	M16	1.4
1 1/4	32	135	17.5	63.5	2	98.4	4	5/8	70	85	3/4	M16	1.8
1 1/2	40	155	19.1	73	2	114.3	4	3/4	75	90	7/8	M20	2.7
2	50	165	20.7	92.1	2	127	8	5/8	75	90	3/4	M16	3.7
2 1/2	65	190	23.9	104.8	2	149.2	8	3/4	85	100	7/8	M20	5.5
3	80	210	27	127	2	168.3	8	3/4	90	110	7/8	M20	7.3
3 1/2	90	230	28.6	139.7	2	184.2	8	3/4	95	110	7/8	M20	9.6
4	100	255	30.2	157.2	2	200	8	3/4	95	115	7/8	M20	12.3
5	125	280	33.4	185.7	2	235	8	3/4	110	120	7/8	M20	15.9
6	150	320	35	215.9	2	269.9	12	3/4	110	120	7/8	M20	22.7
8	200	380	39.7	269.9	2	330.2	12	7/8	120	140	1	M24	36
10	250	445	46.1	323.8	2	387.4	16	1	140	160	1 1/8	M27	57
12	300	520	49.3	381	2	450.8	16	1 1/8	145	170	1 1/4	M30	84
14	350	585	52.4	412.8	2	514.4	20	1 1/8	160	180	1 1/4	M30	113
16	400	650	55.6	469.9	2	571.5	20	1 1/4	165	190	1 3/8	M33	134
18	450	710	58.8	533.4	2	628.6	24	1 1/4	170	195	1 3/8	M33	181
20	500	775	62	584.2	2	685.8	24	1 1/4	185	205	1 3/8	M33	230
24	600	915	68.3	692.2	2	812.8	24	1 1/2	205	230	1 5/8	M39	359

The post Stainless Steel Blind Flange Specification appeared first on Quality Manufacturer of Industrial Pipe Fittings.

ASME B16.5 Blind Flange Archives | Quality Manufacturer of Industrial Pipe Fittings

Stainless Steel 316L Blind Flanges

Dimensional Inspection Steps for Stainless Steel Blind Flanges

Outside Diameter Inspection

Thickness Inspection

Bolt Hole Inspection

Facing Inspection

Marking Inspection

Other Visual Inspections

Specification of Blind Flange

ASTM A182 F316L Flange Chemical Composition

ASTM A182 F316L Flange Mechanical Property

Class 150 lb Blind Flange Dimensions

Class 300 Stainless Steel Flange Weight

Different Face Types

Applications

Stainless Steel Blind Flange Specification

Function of Blind Flange

Specification of Stainless Steel Blind Flange

ASME B16.5 Stainless Steel Blind Flange

Feature

ASME B16.47 Blind Flange

Feature

ASTM A182 F304 Stainless Steel Blind Flange

Chemical Composition

Mechanical Properties

ASME B16.5 Stianless Steel Blind Flange Dimension and Weight

CLASS 150 Dimension and Weight List

CLASS 300 Dimension and Weight List